A noun appearing as G. nogin “boy, lad, urchin” in the Gnomish Lexicon of the 1910s (GL/61); its derivation is unclear since no nearby words seem to be related, but it could be a variation on G. naug “a dwarf” (GL/59).
Neo-Sindarin: I think this word may be salvageable as Neo-Sindarin ᴺS. nogen, reinterpretted as a derivative of the root √NUK “stunted”, originally an adjective ✱nukina used to refer to short persons or children in a less-than-flattering way. Given its glosses, I would use this word mainly for a mischievous or irritating male child; for a more ordinary word for “boy”, I’d instead use S. ion(n).
A noun in the Gnomish Lexicon of the 1910s glossed “hill, knob, prominence” (GL/61), possibly a derivative of the early root ᴱ√NOHO “extended” (QL/67).